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PSYCHROMETRY Solved

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Sol 1)

          Given data,

                             Dry bulb temperature, = 38

                             Wet bulb temperature, = 18

                             Relative humidity after adiabatic humidification, = 60%

  1. Plot the 1st state of the air at 38and 18. As the air is adiabatically humidified the line should be drawn from the 1st point to the relative humidity line of 60% and this line will be parallel to the wet bulb temperature. (In adiabatic humidification process the process line is parallel to wet bulb line)
  2. Note the dry bulb temperature of the final state. The value of dry bulb temperature, = 23           (Answer)

Sol 2)

Given data,

Dry bulb temperature of cool air, = 5

Wet bulb temperature of cool air, = 2

Mass of cool air,  = 2kg

Dry bulb temperature of warm air, = 38

Wet bulb temperature of warm air, = 25

Mass of warm air,  = 1kg

By using formulae,

  • Specific humidity(humidity ratio) of the mixture is given by,

 

                  =

 

                     =                                                                                                        (values   )

 

                      =

 

                      = 0.007kg/kg of dry air.                                    (Answer)

  • Enthalpy of the mixture is given by,

 

                      h=

 

                       =

 

                        =

                        =34.33 kJ/kg of dry air.                         (Answer)    

 

 

 

 By using psychrometric chart,

Plot the two states on the psychrometric chart using the values of dry bulb temperature and the wet bulb temperature.

Join these two points and divide the line in the ratio 2:1

The value of relative humidity and the enthalpy at that point is the required solution.

 Relative humidity (humidity ratio) = 0.0073kg/kg of dry air.          (Answer)

Enthalpy of the mixture = 34.35 kJ/kg of dry air.                                      (Answer)

 

 

Sol 3)

          Given data,

          Sensible heat load= 150KW

          Latent heat load   = 61KW

          Dry bulb temperature, = 25

          Relative humidity,= 50%

          Dry bulb temperature, = 17 

         

          We know that,

          Room sensible heat factor (RSHF) =

                                                                =

                                                                 = 0.710

          First of all, mark room condition of air i.e. 25 and 50% relative humidity as point 1 on psychrometric chart.  Now mark the RSHF value (0.710) on sensible heat factor scale and mark it as point “a”. Now join the point “a” to the alignment circle (26 dry bulb temperature and 50% relative humidity). Now draw a line parallel to the above line from point 1 to point 2 till 17 dry bulb temperature. The wet bulb temperature is noted from point 2.

 

Wet bulb temperature= 13.7                                                (Answer)

Relative humidity= 0.0086 kg/kg of dry air.                           (Answer)

Let volume flow rate be “v”.  We know that,

Room sensible heat (RSH) = 0.02044v ()

                                      150   = 0.02044v (25-17)

                                      150 = 0.02044v 8

                                      v=

                                      v= 917.3                              (Answer)

 

 

Sol 4)

          As per the given data,

RSHF= 

          = 0.752

Using the psychrometric chart we have the value of                         

                                      =

                                      = 344.827 kg/min.

          Refrigeration load=

                                      = 6.3 KW                      

Sol 5)

As per given data,

RSHF=

          =0.732

Mass of air=

                 =

                  = 334.82 kg/min 

The refrigeration load =

                                  = 5.56kW                                     (Answer)

Apparatus dew point= 11 (from psychrometric table)        (Answer)

Volume of recirculated air= 0.6334.82

                                      = 220                           (Answer)

 

 

 

Sol 6)  

As per given data,

          Sensible heat ratio =

                                      = 0.5                              (Answer)

          Using the psychrometric chart,

          We have

          Wet bulb temperature= 13.9                             (Answer)

          Mass of the supply air is given by,

                   =

                   =

                   = 7.81 kg/s                                        (Answer)    

 

 

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